Sanding apparatus



Oct. 18, 1938. G. s. TURNER 2,133,491

SAND'ING APPARATUS Filed May 24, 1937 Patented Oct. 18, 1938 i UNITED STATES PATENT OFFICE SAN DING APPARATUS Guilford S. Turner, Chicago, Ill., assignor to Morris B. Brewster Co. Inc., Chicago, Ill., a corporation of Illinois Application May 24, 1937, Serial No. 144,392 Claims. (Cl. 291-11) The invention relates to sanding apparatus. raised and serves to retract it when the pressure One object of the invention is to provide an on piston I8 is released. A pipe 2| connects the improved remote control valve whereby a cleanhead I6 and the nozzle II to deliver air under ing blast of air will be delivered to the sand depressure from cylinder II to the nozzle II in the. livery pipe when the sander-trap is operated. trap. The pipe I9 is usually of slightly greater Another object of the invention is to provide capacity than the pipe 2| or the nozzle II to an improved remote control valve whereby a cause sulicient pressure to be built up in the cleaning blast of air will be delivered to the sand cylinder II and force the piston I8 downwardly delivery pipe when the sander is initially operated While the sander is in operatio-n. I and which will deliver a small volume of air to The piston I8 comprises a packing-ring I8b l0 the clean-out duct continuously during the opwhich is secured by a follower I8c and nut I8a eration of the sander to prevent particles of sand against the top of the body of piston I8. Said from working back into the piping between the piston body is secured by the nut against a trap and control valve. shoulder 22a on a combined stem 22 for the pis- Another object of the invention is to provide ton I8 and a valve 25. The piston I8 shifts stem 15 an improved remote control valve for sanding 22 to operate the valve 25 for controlling the apparatus, which is simple in construction, efclean-out blasts. The piston, cylinder and spring iicient in operation, and can be produced at a low serve as Huid-pressure and spring-controlled cost. means for shifting the valve.

v20 Other objects of the invention will appear from v When the sander is idle, valve 25 will be held 20 a consideration of the following detailed descripagainst a seat I5a to cut off air from the supply tion. reservoir to the b-loW-out duct I4.

The invention consists in the several novel fea- The lower end of casing I5 is provided with a tures which are hereinafter set forth and arev cylindrical chamber 'I5 and a smaller chamber 25 more particularly dened by claims at the con- 2.4 above and in communication with said cham- 25 clusion hereof. ber I5a, and has a cap 3| which is screw-threaded In the drawing: intoand shouldered against the casing to form Fig. 1 s a sectional view of sanding apparaa fluid-tight connection. A pipe 35 threaded tus embodying the invention. into cap 3|, is connected to the usual air reser- Fig. 2 is a section of the remote control valve in voir and serves to deliver air under pressure to 30 its operative position which it assumes while the the casing I5 for delivery to the cleanout duct. sand-trap is operative to discharge sand to the A pipe 32 is threaded into one side of the casing sand delivery pipes. I5 and into the sander-trap I0 to deliver fiuid Fig. 3 is a section of a modified form of the inunderpressure from the casing I5 to the clean- 35 vention. out duct. Usually twoopenings 33 are provided 35 The invention is exemplified in connection in casing I5 for convenience in attaching the with a sander-trap I0 which comprises a nozzle pipe 32 to the casing. The opening 33 which is II for delivering air under pressure to force the not used, is closed by a plug 34. The casing I5 sand entering the trap from a delivery pipe I2 is provided with ears or lugs I5d whereby it may through the trap-body and through the pipe I3 be mounted in any desired position on the loco- 40 for delivering the sand to one of the wheels or motive. rails. A duct I4 is provided in the outlet portion The opening in the casing leading to pipe 32 of the sander casing for directing a cleaning communicates with thekcylindrical chamber 24. blast into the upper end of the pipe I3 for blow- At the lower end of chamber 24 the valve-seat ing out the pipe at the beginning and also at the I5a4 is formed. An annular inclined upwardly 45 end of each track-sanding operation. facing valve-seat 30 is formed in the top of the The remote control valve comprises a generally cap 3|. The valve-stem 22 carries at its lower cylindrical casing I5 in the upper end of which end the valve 25 which has an upwardly conis formed a cylinder II in which a piston I8 is vergeht annular face 26 for engaging the seat 5l) slidable. A head II is removably secured to and I5at and a downwardly convergent annular face 50v closes the top of the casing I5. A pipe I9 from 28 adapted to fit on and engage the seat 3U in the usual operators control-valve (not shown) the cap 3|. Valve 25 operates vertically in and is connected to the head I6 to deliver air under across a chamber I5h in the casing I5 between pressure into cylinder I1 for shifting the pisvalve-seats I5a and 3|). When the sander-trap ton I8. A spring 20 normally holds the piston is not in operation, the spring 20 will hold the 55 piston I8, valve-stem 22 and valve 25 raised in the position shown in Fig. 1. At this time annular face 26 of valve 25 will be against seat I5a and no air from the supply pipe 35 will pass from chamber Ih to the clean-out pipe 32.

When the piston I8 is shifted at the beginning of a sanding operation, it will lower valve 25 away from seat I5a and permit a blast of air from pipe 35 to pass through valve-seat 30, chambers I5h and 24, pipe 32, to the clean-out duct I4. When the valve 25 is arrested by valve-seat 30, the valve will cut off the air from pipe 35 and discontinue the cleaning blast. At the end of a sanding operation, when the pressure in cylinder I'I is released and with the aid of pressure from pipe 35, valve 25 will be restored to its normal position in engagement with valve-seat I5a and, after permitting a cleaning blast to pass to the duct I4, will cut off the air to the cleaning duct I4 while the sander is idle.

A small angular port 36 is formed in valve 25 to permit air to leak or slowly flow from pipe 35 through valve 25 and into chambers I5h, 24 to pipe 32 and to the clean-out port I4 while the face 28 of valve 25 engages seat 30 on cap 3|, which position it assumes during the operation of the sander. This port delivers a small stream of air to blow-out duct I4 to prevent effectively any sand from being drawn or blown into the line leading to the remote control valve.

In the modification illustrated in Fig. 3 a small groove 3'I is formed in the valve-seat 30 to permit air to leak past valve 25 to the pipe 32, while the sander is in operation, and said valve is seated on seat 30.

In operation, the engineer will, through the usual operating Valve located in the engineers cab of the locomotive, admit air under pressure through pipe I9 into the cylinder I'I from which it will pass through pipe 2| to the nozzle II. Normally the valve 25 is held against seat I5a by spring 20. The pressure in the cylinder I'I of the remote control valve will shift the piston I8 to move valve 25 away from valve-seat I5a and against valve-seat 30. During the downward movement of the valve 25, air under pressure from pipe 35 will flow around valve 25 through chambers |511, 24 and thence through pipe 32 and blow-out duct I4 into the sander-pipe I3. When the valve-face 28 engages valve-seat 30 the main supply of air from the reservoir through pipe 35 to the blow-out duct, will be cut off.

During the operation of the sander, valve 25 remains against the seat 30 in cap 3| and air under pressure will leak or flow slowly through duct 36 in valve 25 or groove 31 in valve-seat 30 to cause a small flow of air through pipe 32 and the duct I4 so that during the operation of the nozzle II, the entry of sand into the pipe 32 and the remote control valve will be prevented.

The leak-port remains effective while the sander is in operation and the blast to the cleanout duct is cut off at the remote control valve for the purpose of preventing the entry of sand into the line between the trap and the valvecasing and into the valve-casing where sand may interfere with the seating of the valve.

The single double acting valve with opposite faces for cutting o the supply of fluid before and after the clean-out blast, provides a simple and inexpensive construction. By forming one of the valve-seats in the cap at the lower end of the casing, the removability of the cap makes it easy to re-shape the seat if necessary.

The valve with oppositely facing valve-faces and co-acting with tapered seats, respectively, has been found to be efficient in use and leakage which frequently occurs when cylindrical valves are used, has been avoided.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is:

1. The combination with a sand-trap provided with a nozzle for a sanding blast and a duct for a cleaning blast, of a valve-casing, connections for delivering fluid under pressure to the casing and from the casing to the clean-out duct, valvemeans slidably mounted in the casing, adapted to cut off the fluid to the clean-out duct from the casing and to control a cleaning blast of limited duration, to the clean-out duct and from the casing, valve-shifting means, and means for flowing a small quantity of fluid from the casing to the clean-out duct after the valve-means has been operated to cut oil the clean-out blast and duringthe operation of the trap.

2. The combination with a sand-trap provided with a nozzle for a sanding blast and a duct for a cleaning blast, of a Valve-casing, connections for delivering fluid under pressure to the casing and from the casing to the clean-out duct, a valve-member slidably mounted in the casing, adapted to cut off the fluid to the clean-out duct from the casing and to control a cleaning blast of limited duration, to the clean-out duct and from the casing, valve-shifting means, and means in the form of a leak port in the Valvemember for flowing a small quantity of fluid from the casing to the clean-out duct after the valve-member has been operated to cut off the clean-out blast and during the operation of the trap'.

3. The combination with a sand-trap provided with a nozzle for a sanding blast and a duct for a cleaning blast, of a valve-casing, connections for delivering uid under pressure to the casing and from the casing to the clean-out duct, Valve-means slidably mounted in the casing, adapted to cut off the fluid to the clean-out duct from the casing, and to control the valve-means for delivering a cleaning blast of limited duration, to the clean-out duct and from the casing, valve shifting means, and means in the form of a small groove in the casing for flowing a small quantity of fluid from the casing to the clean-out duct after the valve-means has been operated to cut olf the clean-out blast and during the operation of the trap.

4. The combination with a sand-trap provided with a jet for a sanding blast and a duct for a cleaning-blast, of a valve-casing comprising a body and a removable cap at one end of the body, a pipe for delivering fluid under pressure to the casing, leading into and connected to the cap, a connection for delivering fluid from the casing to the clean-out duct, a valve-member for cutting 01T the fluid from the casing to the cleanout duct, slidably mounted in the casing land having oppositely disposed faces, correspondingly disposed valve seats, one of which is formed in the cap and the other of which is formed in the body of the casing, adapted to be engaged, respectively, by the faces of the valve-member to cut oif the iiuid to the clean-out duct, and to control, when it passes between the seats, a

and having oppositely disposed inclined faces, correspondingly inclined valve-seats, one of which is formed in the cap and the other of which is formed in the body of the casing, adapted to be engaged, respectively, by the faces of the valve-member to cut off the fluid to the clean-out duct and to control, when it passes between the seats, a clean-out blast of limited duration, a stern on the Valve, a cylinder in the casing, and a piston in the cylinder and connect- 10 ed to the stem.

GUILFORD S. TURNER. 

